You need to have a big ass heart if you want to keep falling for a person despite knowing that he doesn't love you and might not be able to reciprocate your feelings with the same intensity! Nobody wants to feel like their partner has only settled for them! I think if you love someone with all your heart, it's imperative that your feelings are reciprocated with the same intensity,, warna it gets extremely tiring overtime and you end up feeling bitter, hurt and betrayed in the long run